package org.apache.ibatis.mapping;

import javax.sql.DataSource;

import org.apache.ibatis.transaction.TransactionFactory;

/**
 * @author Clinton Begin
 *
 * DB 环境
 */
public final class Environment {

  /**
   * 环境编号
   */
  private final String id;

  /**
   * TransactionFactory 对象
   */
  private final TransactionFactory transactionFactory;

  /**
   * DataSource 对象
   */
  private final DataSource dataSource;

  public Environment(String id, TransactionFactory transactionFactory, DataSource dataSource) {
    if (id == null) {
      throw new IllegalArgumentException("Parameter 'id' must not be null");
    }
    if (transactionFactory == null) {
        throw new IllegalArgumentException("Parameter 'transactionFactory' must not be null");
    }
    this.id = id;
    if (dataSource == null) {
      throw new IllegalArgumentException("Parameter 'dataSource' must not be null");
    }
    this.transactionFactory = transactionFactory;
    this.dataSource = dataSource;
  }

  /**
   * 构造器
   */
  public static class Builder {

    /**
     * 环境编号
     */
    private String id;

    /**
     * TransactionFactory 对象
     */
    private TransactionFactory transactionFactory;

    /**
     * DataSource 对象
     */
    private DataSource dataSource;

    public Builder(String id) {
      this.id = id;
    }

    public Builder transactionFactory(TransactionFactory transactionFactory) {
      this.transactionFactory = transactionFactory;
      return this;
    }

    public Builder dataSource(DataSource dataSource) {
      this.dataSource = dataSource;
      return this;
    }

    public String id() {
      return this.id;
    }

    public Environment build() {
      return new Environment(this.id, this.transactionFactory, this.dataSource);
    }

  }

  public String getId() {
    return this.id;
  }

  public TransactionFactory getTransactionFactory() {
    return this.transactionFactory;
  }

  public DataSource getDataSource() {
    return this.dataSource;
  }

}
